@inproceedings{splittingline2011,
author = {Buchin, Kevin and Kusters, Vincent and Speckmann, Bettina and
Staals, Frank and Vasilescu, Bogdan},
title = {A splitting line model for directional relations},
booktitle = {Proc. 19th International Conference on Advances in Geographic
Information Systems (ACMGIS)},
series = {GIS '11},
year = {2011},
isbn = {978-1-4503-1031-4},
location = {Chicago, Illinois},
pages = {142--151},
numpages = {10},
url = {http://doi.acm.org/10.1145/2093973.2093994},
doi = {10.1145/2093973.2093994},
acmid = {2093994},
publisher = {ACM},
address = {New York, NY, USA},
keywords = {directional relations, geometric algorithms, splitting line},
}